If you need to do some data storage in Arduino but found that the EEPROM in ATmega chip too limited, then this I2C EEPROM module is your best choice. This module is based on the EEPROM chip AT24C256, which has 256k bit capacity. It communicate with Arduino using I2C bus.
**I2C EEPROM Introduction on Arduino
Specification
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Onboard chip AT24C256 chip
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Onboard the I2C communications required pull-up resistor
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All pins are leads and marked
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PCB board Dimensions : 36.5 (mm) x12 (mm)